The angular velocity vector of the rigidbody.

In most cases you should not modify it directly, as this can result in unrealistic behaviour.

	// Change the material depending on the speed of rotation
	var fastWheelMaterial : Material;
	var slowWheelMaterial : Material;
	function Update () {
		if (rigidbody.angularVelocity.magnitude < 5) {
			renderer.sharedMaterial = slowWheelMaterial;
		}	
		else {
			renderer.sharedMaterial = fastWheelMaterial;	
		}
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public Material fastWheelMaterial;
    public Material slowWheelMaterial;
    void Update() {
        if (rigidbody.angularVelocity.magnitude < 5)
            renderer.sharedMaterial = slowWheelMaterial;
        else
            renderer.sharedMaterial = fastWheelMaterial;
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public fastWheelMaterial as Material

	public slowWheelMaterial as Material

	def Update() as void:
		if rigidbody.angularVelocity.magnitude < 5:
			renderer.sharedMaterial = slowWheelMaterial
		else:
			renderer.sharedMaterial = fastWheelMaterial